2012A&A...537A.118R


Query : 2012A&A...537A.118R

2012A&A...537A.118R - Astronomy and Astrophysics, volume 537A, 118-118 (2012/1-1)

The Hamburg/ESO R-process Enhanced Star survey (HERES). VII. Thorium abundances in metal-poor stars.

REN J., CHRISTLIEB N. and ZHAO G.

Abstract (from CDS):

We report thorium abundances for 77 metal-poor stars in the metallicity range of -3.5<[Fe/H]←1.0, based on ``snapshot'' spectra obtained with VLT-UT2/UVES during the HERES Survey. We were able to determine the thorium abundances with better than 1σ confidence for 17 stars, while for 60 stars we derived upper limits. For five stars common with previous studies, our results were in good agreement with the literature results. The thorium abundances span a wide range of about 4.0dex, and scatter exists in the distribution of log(Th/Eu) ratios for lower metallicity stars, supporting previous studies suggesting the r-process is not universal. We derived ages from the log(Th/Eu) ratios for 12 stars, resulting in large scattered ages, and two stars with significant enhancement of Th relative to Eu are found, indicating the ``actinide boost'' does not seem to be a rare phenomenon and thus highlighting the risk in using log(Th/Eu) to derive stellar ages.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: abundances - galaxies: evolution - Galaxy: halo - stars: Population II - Galaxy: abundances

CDS comments: Paragraphe 5 HE 0305-6024 is a probable misprint.

Simbad objects: 112

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Number of rows : 112
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HE 0005-0002 Pe* 00 08 06.7698834048 +00 14 08.966495364   15.374 14.552 14.031 13.489 ~ 6 0
2 HE 0023-4825 Pe* 00 25 50.3198011464 -48 08 27.012673788   14.298 13.830 13.485 13.161 ~ 5 0
3 BPS CS 29497-0004 Pe* 00 28 06.9155612016 -26 03 04.269055032   14.76 14.07 13.583 13.116 ~ 48 0
4 HE 0029-1839 Pe* 00 32 07.7474784456 -18 22 36.813769212   15.207 14.493 14.044 13.579 ~ 7 0
5 HE 0039-4154 Pe* 00 41 43.4057863080 -41 37 57.347566500   14.654 13.832 13.318 12.786 ~ 11 0
6 HE 0043-2845 Pe* 00 45 55.9363003296 -28 29 17.186896932   15.96 15.32 14.939 14.555 ~ 8 0
7 HE 0051-2304 Pe* 00 53 51.5208063120 -22 47 54.140446860   16.099 15.166 14.610 14.061 ~ 5 0
8 HE 0054-0657 Pe* 00 57 20.7791344272 -06 40 59.429389872   16.037 15.457 15.088 14.716 ~ 5 0
9 HD 6268 Pe* 01 03 18.1716378504 -27 52 49.953768852   9.725 9.046 8.601   F/Gw 143 0
10 HE 0105-6141 Pe* 01 07 37.8492758736 -61 25 17.694026832   14.22 13.64 13.113 12.660 ~ 14 0
11 HE 0109-3711 Pe* 01 11 38.4089770056 -36 55 17.114003076   16.668 16.290   15.691 ~ 7 0
12 HE 0121-2826 Pe* 01 23 37.1402559984 -28 10 28.027506540   16.196 15.471 15.042 14.571 ~ 6 0
13 BPS CS 31082-0001 Pe* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 266 0
14 HE 0143-1135 Pe* 01 46 10.3260842520 -11 20 10.803530256   16.047 15.479 15.151 14.769 ~ 6 0
15 BPS CS 22175-0007 Pe* 02 17 26.6223977472 -09 00 45.171469044   14.14 13.49 13.038 12.571 ~ 11 0
16 BPS CS 29510-0058 Pe* 02 21 46.5781548912 -24 01 58.700555292   14.2 13.53 13.070 12.628 ~ 10 0
17 HE 0240-0807 Pe* 02 42 57.7258422024 -07 54 35.382610116   15.867 14.971 14.447 13.889 ~ 9 0
18 BPS CS 31079-0028 Pe* 03 01 00.6866893176 +06 16 31.808500140   13.900 13.211 12.713 12.190 ~ 25 0
19 HE 0300-0751 Pe* 03 03 04.0689183432 -07 39 42.390537660     16.256   15.333 ~ 6 0
20 HE 0315+0000 Pe* 03 17 39.0100103112 +00 11 04.600281192     15.516   14.506 ~ 12 0
21 HE 0323-4529 Pe* 03 25 30.2051785872 -45 19 31.439235324   15.373 14.734 14.300 13.862 ~ 6 0
22 HE 0328-1047 Pe* 03 30 45.3602395944 -10 37 09.843890628   14.97 14.36 13.926 13.543 ~ 14 0
23 HE 0330-4144 Pe* 03 32 16.2160492344 -41 34 48.717681132   16.392 16.013 15.719 15.383 ~ 4 0
24 HE 0338-3945 Pe* 03 39 55.0068570984 -39 35 42.902896452   15.753 15.333 15.098 14.787 CEMP-r/s 36 0
25 HE 0340-5355 Pe* 03 41 34.5669703344 -53 46 18.053151492   16.027 15.249 14.768 14.278 ~ 6 0
26 HE 0341-4024 Pe* 03 43 08.0865920640 -40 15 29.363412132   14.051 13.638 13.364 13.047 ~ 5 0
27 HE 0347-1819 Pe* 03 49 18.3713335200 -18 10 40.587891744     15.592   14.719 ~ 5 0
28 HE 0353-6024 Pe* 03 53 59.3229270312 -60 15 15.437750472   17.137 16.561 16.133 15.736 ~ 7 0
29 HE 0442-1234 Pe* 04 44 51.7052109360 -12 28 45.533823744     12.914   11.672 ~ 13 0
30 HE 0450-4705 Pe* 04 51 33.5653281792 -47 00 03.814506252   14.892 14.334 13.962 13.531 CEMP-no 9 0
31 HE 0501-5139 Pe* 05 02 48.2100929328 -51 35 36.308316876   16.573 16.094 15.778 15.475 ~ 8 0
32 HE 0520-1748 Pe* 05 22 25.8629025384 -17 46 06.877320744   16.068 15.403 14.981 14.521 ~ 5 0
33 HE 0524-2055 Pe* 05 27 04.4443239912 -20 52 42.096542448     14.013   12.937 ~ 11 0
34 HE 0534-4615 Pe* 05 35 52.9449395640 -46 13 35.975952660     15.056   14.317 ~ 6 0
35 HD 74462 RG* 08 48 20.6518818744 +67 26 59.884515744   9.65 8.69 8.25   G5IV 125 0
36 HE 0926-0508 Pe* 09 28 55.3529041896 -05 21 40.492169352 12.410 12.34 12.194 11.895 11.617 ~ 16 0
37 HD 88609 Pe* 10 14 28.9853799600 +53 33 39.342740796 9.930 9.540 8.620 7.78 7.15 G5IIIw 194 0
38 HE 1052-2548 Pe* 10 55 20.5362450168 -26 04 48.041388192   13.492 13.188 12.906 12.541 ~ 8 0
39 HE 1100-0137 Pe* 11 02 55.5270699432 -01 53 40.948297944   16.113 15.780 15.483 15.151 ~ 6 0
40 HE 1124-2335 Pe* 11 27 26.9490704592 -23 52 05.593418292     14.634   13.721 CEMP-no 13 0
41 HE 1126-1735 Pe* 11 28 51.3986278320 -17 51 42.823390140     15.965   15.232 ~ 5 0
42 HE 1127-1143 Pe* 11 29 50.6275439136 -12 00 12.581828208     15.885 15.434 15.002 ~ 12 0
43 HE 1132+0204 Pe* 11 34 51.0067157160 +01 47 27.921612300   15.319 14.665 14.214 13.754 ~ 8 0
44 HE 1207-2031 Pe* 12 09 50.8565241936 -20 47 43.782532368   16.421 16.157 15.858 15.543 ~ 6 0
45 HE 1219-0312 Pe* 12 21 34.1430245160 -03 28 39.636260184     15.940   15.043 ~ 34 0
46 HE 1221-1948 Pe* 12 23 47.7424050360 -20 04 45.795803556 16.192   15.900   15.270 CEMP-no 9 0
47 HD 108317 Pe* 12 26 36.8319587208 +05 18 09.023783400       7.7   G2IVm-5 154 0
48 HE 1225+0155 Pe* 12 28 04.7630152704 +01 38 32.960648436   13.628 12.890 12.400 11.930 ~ 11 0
49 HD 108577 PM* 12 28 16.8614710944 +12 20 41.089853184   10.18 9.55 9.8   KIIvw 70 0
50 BD+04 2621 * 12 28 44.6433260568 +04 01 26.631027984   10.86 9.90     KIIvw 56 0
51 HD 110184 Pe* 12 40 14.0781612216 +08 31 38.057301300 10.20 9.45 8.27 8.52   KIIvw 133 0
52 HE 1245-1616 Pe* 12 47 56.7656872032 -16 32 44.041335216     16.158   15.562 CEMP-s 8 0
53 HE 1246-1344 Pe* 12 49 20.2451280432 -14 00 41.594899716     14.388   13.358 ~ 6 0
54 HE 1247-2114 Pe* 12 50 05.1153407832 -21 30 47.480200956     15.010   14.008 ~ 6 0
55 HE 1251-0104 Pe* 12 53 52.0739186880 -01 20 35.515693716     15.067   14.188 ~ 5 0
56 HE 1256-0651 Pe* 12 59 13.0921923240 -07 07 19.234985808   15.268 14.925 14.632 14.287 ~ 6 0
57 HE 1300-2431 Pe* 13 03 00.0415258848 -24 47 12.250939488     14.541   13.404 ~ 6 0
58 HE 1300-0642 Pe* 13 03 23.3955390912 -06 58 23.230314660   15.755 15.131 14.682 14.243 ~ 7 0
59 HE 1305-0331 Pe* 13 07 58.9409653392 -03 47 40.390352664     16.377   15.781 CEMP-no 10 0
60 HD 115444 Pe* 13 16 42.4590842616 +36 22 52.692135420   9.77 8.97 8.3 7.88 G9V 232 0
61 HE 1330-0354 Pe* 13 33 10.6751556960 -04 10 05.801861928   15.248 15.000 14.730 14.380 CEMP-no 16 0
62 HE 1332-0309 Pe* 13 34 37.8879875544 -03 24 52.788038436   16.058 15.416 14.952 14.530 ~ 5 0
63 HE 1337-0453 Pe* 13 39 58.2232572432 -05 08 31.567427484   16.432 16.173 15.907 15.558 ~ 6 0
64 HD 122563 Pe* 14 02 31.8455084952 +09 41 09.944391876 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 797 0
65 HD 122956 PM* 14 05 13.0244442888 -14 51 25.455804480   8.18 7.25 6.88   G6IV/VwF6 147 0
66 BD+08 2856 * 14 23 58.1664038424 +08 01 33.333124908   10.90 10.08     KIIvw 61 0
67 HD 126587 Pe* 14 27 00.3636631296 -22 14 38.992940592   9.88 9.60 8.75   CEMP-no 128 0
68 HE 1431-2142 Pe* 14 34 06.7074150768 -21 55 16.717770912     15.859   15.021 ~ 5 0
69 HD 128279 Pe* 14 36 48.5108525999 -29 06 46.612858494 8.64 8.63 8.00     Gw 183 0
70 COS 82 RB? 15 09 58.6103318448 +67 16 20.032584024   18.53 17.006   15.614 ~ 31 0
71 BPS CS 30306-0132 Pe* 15 14 18.9191634456 +07 27 02.680959780   13.62 12.73 12.421 11.948 ~ 31 0
72 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1872 0
73 2MASS J15184449+0202053 RG* 15 18 44.4962016312 +02 02 05.423756928   14.4600 13.2300   12.0046 ~ 27 0
74 2MASS J15184495+0202034 RG* 15 18 44.9526006144 +02 02 03.568247448   13.8900 12.2000   10.6289 ~ 34 0
75 HE 1523-0901 Pe* 15 26 01.0697532504 -09 11 38.885639784   12.37 11.50 10.476 9.863 CEMP 66 0
76 2MASS J17163748+4306155 RG* 17 16 37.4894075472 +43 06 15.600437640   13.47 12.18     ~ 69 0
77 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1997 0
78 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 207 0
79 HD 175305 RG* 18 47 06.4416868934 +74 43 31.451436187 8.07 7.93 7.18 6.52 6.03 G5III 207 0
80 HD 186478 Pe* 19 45 14.1409752672 -17 29 27.071239056   10.116 9.302 8.527 7.961 K2III 142 0
81 BD-18 5550 Pe* 19 58 49.7371417608 -18 12 11.140126164 10.18 10.03 9.35 9.04 8.74 CEMP-no 168 0
82 HD 204543 * 21 29 28.2126852216 -03 30 55.353564216   9.17 8.30 7.99   F6/8(V) 131 0
83 NGC 7078 341 RG* 21 29 54.9258244080 +12 13 22.484816292   13.72 12.54   11.22 ~ 49 0
84 2MASS J21295666+1209463 RG* 21 29 56.6627934840 +12 09 46.341312228   14.45 12.90     ~ 34 0
85 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3021 0
86 2MASS J21295856+1209214 RG* 21 29 58.5643129152 +12 09 21.382732260   14.26 12.83     ~ 27 0
87 HD 205445 * 21 35 59.7211956552 -25 40 04.357412076   10.289 9.403     G8/K0III/IV 8 0
88 HE 2133-1432 Pe* 21 36 22.5405008952 -14 19 20.289024444   15.860 15.348 14.998 14.604 ~ 5 0
89 HE 2134+0001 Pe* 21 37 08.1917818080 +00 15 04.521444804     15.792   14.923 ~ 7 0
90 HE 2148-1247 Pe* 21 51 17.9096426016 -12 33 41.557315896   15.2 14.79     CEMP-r/s 46 0
91 HE 2151-2858 Pe* 21 54 01.5797307888 -28 44 20.065924968   16.570 16.072 15.733 15.382 ~ 6 0
92 HE 2153-2719 Pe* 21 56 04.0744922544 -27 04 49.793041416     15.045   14.053 ~ 5 0
93 BPS CS 30337-0097 Pe* 22 01 21.5117972016 -30 57 57.614539932   13.98 13.22 12.693 12.161 ~ 11 0
94 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 427 0
95 BPS CS 22886-0042 Pe* 22 20 25.8163819488 -10 23 20.107482000   14.106 13.275 12.763 12.269 ~ 22 0
96 HE 2219-0713 Pe* 22 22 15.7725558672 -06 58 34.483425996     14.212   13.019 ~ 6 0
97 HE 2224+0143 Pe* 22 27 23.1215289240 +01 58 33.066485508   14.54 13.83 13.208 12.733 ~ 19 0
98 HE 2224-4103 Pe* 22 27 48.2870207784 -40 48 24.826205268   15.586 14.910 14.461 14.020 ~ 5 0
99 BPS CS 29491-0069 Pe* 22 31 02.1859040712 -32 38 36.526573572   13.72 13.09 12.654 12.175 ~ 28 0
100 HE 2229-4153 Pe* 22 32 49.0491790560 -41 38 25.162910736     13.322   12.447 ~ 9 0
101 HE 2234-0521 Pe* 22 36 37.7204812080 -05 06 05.288613516     15.383   14.537 ~ 5 0
102 HE 2247-3705 Pe* 22 50 29.5053156120 -36 49 16.398287400     16.018   15.209 ~ 5 0
103 HE 2250-2132 Pe* 22 53 40.4804163912 -21 16 23.967776316   14.905 14.392 14.063 13.662 ~ 6 0
104 HE 2252-4157 Pe* 22 55 34.2222588024 -41 41 29.214040164   16.961 16.283 15.891 15.455 ~ 4 0
105 HE 2259-3407 Pe* 23 02 15.7379336352 -33 51 11.284221996   17.264 16.864 16.654 16.330 ~ 5 0
106 HE 2311+0129 Pe* 23 14 21.3832232736 +01 45 24.248607048     14.389   13.509 ~ 5 0
107 HE 2326+0038 Pe* 23 28 56.9640379392 +00 54 36.185614848   14.782 14.175 13.691 13.273 ~ 7 0
108 HD 221170 Pe* 23 29 28.8087143040 +30 25 57.849303180 9.43 8.74 7.66     G2IV 273 0
109 HE 2327-5642 Pe* 23 30 37.0896973176 -56 26 14.385030648   14.590 13.881 13.425 12.948 ~ 30 0
110 BPS CS 22945-0028 Pe* 23 31 13.5632038296 -66 29 57.771375900 15.167 15.32 14.64   13.728 ~ 16 0
111 HE 2338-1618 Pe* 23 40 36.3944874312 -16 01 26.775190668   15.862 15.358 15.093 14.621 ~ 5 0
112 HE 2345-1919 Pe* 23 47 55.5253415712 -19 02 37.605636780   15.854 15.092 14.764 14.486 ~ 6 0

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2022.05.28-08:56:04

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